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Return small HTML page

Deliver an HTML page from an HTML string directly inside the Worker script.
const html = `<!DOCTYPE html>
<h1>Hello World</h1>
<p>This markup was generated by a Cloudflare Worker.</p>
async function handleRequest(request) {
return new Response(html, {
headers: {
'content-type': 'text/html;charset=UTF-8',
addEventListener('fetch', event => {
return event.respondWith(handleRequest(event.request));